Last Tango in Beijing
This how-to video shows political resisters how to do a subversive dance step, the "Tank Man Tango," to commemorate the ballet that took place two decades earlier and became frozen into an iconic image, albeit one for which collective memory can be altered by Photoshop. You can see the footage of the original "Tiananmen Tango" here.
(Thanks to Peggy Weil for the link!)
Update: Nedra Weinreich provides a link to the Lens blog from the New York Times, which shows another angle on the tank man.